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The upper thresholds of burst duration that produced continuous apparent motion were measured when stimuli were successively presented using three loudspeakers arranged in the horizontal plane. Stimuli tested were broadband noises with amplitude modulation, tones and bandpass noises. The upper threshold depended on stimulus and tended to be longer than that of 72 ms for an unmodulated broadband noise. For amplitude-modulated broadband noises, there was an increase in the upper threshold from 72 to 290 ms as the modulation index increased from 0.0 to 1.0. However, the upper threshold decreased from 360 to 135 ms with an increase in modulation frequency from 4 to 64 Hz. For tones, the upper threshold displayed a concave function of frequency with a minimum of 71 ms at a frequency of 3 kHz. For bandpass noises, the upper threshold fell from 347 to 101 ms as the bandwidth broadened from 1/12 to 3.0 octaves. These results are discussed in connection with perception for amplitude modulation and mechanisms to detect motion.

Upper threshold of burst duration for continuous apparent motion. Effects of amplitude modulation and frequency band.